Gila River Power Block 3 — Plant Summary
- EIA Plant ID
- 59784
- Capacity
- 619 MW
- Primary Fuel
- Natural Gas
- Technology
- Natural Gas Fired Combined Cycle
- Status
- Operating
- Location
- Maricopa, AZ
- Operating Since
- 2003
- Generators
- 3
- Operator
- Salt River Project
- Parent Company
- Fortis
- Annual Generation
- 2,914,751 MWh
- Capacity Factor
- 53.4%
- Balancing Authority
- Tucson Electric Power Company
- ISO/RTO
- —
- NERC Region
- WECC
Gila River Power Block 3
OperatingNatural Gas
Ranked #17 of 33 Natural Gas plants in AZ#379 of 2009 nationally
619 MW Natural Gas operating in Maricopa, AZ — Tucson Electric Power Company
EIAWD
619 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combined Cycle
Technology
2003
Operating Since
Location
Coordinates
32.9750, -112.6944
County
Maricopa, AZ
Nearby Plants
- Gila River Power Block 4Natural Gas619 MW · 0.0 km
- Gila River Power Block 1Natural Gas619 MW · 0.0 km
- Gila River Power Block 2Natural Gas619 MW · 0.0 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Salt River Project | UNS Electric | — |
| Owner(s) | Tucson Electric Power Co, UNS Electric, Inc | Fortis | — |
| Status | Operating | — | — |
Ownership Chain
About
Gila River Power Block 3 is a 619 MW natural gas-fired combined cycle power plant located in Maricopa County, Arizona. The plant began operating in 2003 and consists of 3 generators. It is owned by Fortis, a Canadian company, and operated by Salt River Project. The plant operates within the Tucson Electric Power Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year of data, Gila River Power Block 3 generated 2,914,751 MWh of electricity, achieving a capacity factor of 53.4%. The plant's installed cost was $551.23 per kW, according to FERC data. Gila River Power Block 3 is ranked as the 17th largest power plant out of 26 in Arizona, and 384th largest out of 945 nationally.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Tucson Electric Power Company
Grid Voltage
500 kV
Regulatory Status
RE
Entity Type
Political Subdivision
Sector
Electric Utility
Generation
215.1K MWh
Latest Month
2.9M MWh
Annual Generation
53.4%
Capacity Factor
Jan 2023 – Dec 2025
Financial DataBeta
Source: FERC Form 1HIGH
$645/kW
Installed Cost
$21.6/MWh
Operating Cost
UNS Electric, Inc.
Reporting Utility
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (1)Beta
Deals·m and a
TEP buys gas-fired plant to reduce coal reliance
Tucson Electric Power Co. has finalized the planned purchase of a gas-fired power plant in Gila Bend, in a key move to cut its reliance on...
Tucson Electric Power Co. (buyer)TEP (buyer)
Arizona Daily Star·8 years ago
Last updated 2026-03-14
View all articles